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Feb 20, 2009 at 08:37 AM

Reverse Proxy - Apache vs SAP Web Dispatcher



my config consists in a portal (EP7.0 - DB/CI + AS) and an ECC system (ECC 6.0 - DB/CI + AS).

Web developments are based on Abap Web Dynpro and are also located on ECC.

To ensure load balancing there are 2 web dispatchers : one on EP DB/CI, one on ECC DB/CI.

Those 2 systems are located in intranet. Intranet access are realized via http.

Moreover I need to open this solution to internet. I need a component to filter access in DMZ and ensure reverse proxy + https functions.

Technical target chain links are depicted below.

internet access : browser (https) -

> (https) reverse proxy in DMZ (http) -

> IS (Portal/ECC)

intranet access : browser (http) -

> IS (portal/ECC)

At the moment two application gateway solutions have been identified :

  • Apache (MOD_PROXY + MOD_HTTPS) - My configuration is based on Linux

  • SAP Web Dispatcher ("cascading" implementation as described in OSS note 740234)

I'm looking for PROs and CONs of those 2 solutions and I'm also seeking for the impact of ensuring https encryption/decryption at the application gateway level ("a priori" this usage is not transparent in term of server sizing - CPU/memory, do I require to implement an SSL accelerator ?).